Vendor IDs are read from ~/.android/adb_usb.ini. The format is very simple:
1 number per line. First number is ID count, followed by the ID themselves.
Lines starting with # are considered comments.
Other misc changes: moved VENDOR_ID_* to usb_vendors.c to prevent direct
access. Made transport_usb.c reuse the USB constant introduced in usb_osx
(moved them to adb.h)
Added usb_vendors.* which handles creating (and deleting) a list of vendor ids.
This list is meant to be used everywhere the built-in lists (usb_osx), or the
built-in vendor IDs (transport_usb) were used.
For now the list is only built with the built-in VENDOR_ID_*. Next step
is to read a small file created from all the SDK add-on.
Other misc changes: made is_adb_interface present only if ADB_HOST is true
to prevent accessing a list that doesn't exist (usb_vendors is only
compiled for the host version of adb).
Enumerating all vendor+product id combinations is not practical.
This modifies the matching algorithm to use the adb interface
subclass/protocol instead (0x42/0x1).
Signed-off-by: Dima Zavin <dima@android.com>